A person covers first 25 km in 60 minutes and next 38 km in 30 minutes. What is the average speed for the whole journey?
Answer & explanation
Correct answer: option 3
Average speed = $\frac{total\; distance}{total\; time}$
= $\frac{25+38}{1.5}$
= $\frac{63}{1.5}$ = 42 km/hr